SYSAUX 表空间问题解决

1、SYSAUX表空间问题解决通过 awrinfo.sql 以及 v$sysaux_occupants 对 SYSAUX 空间分析，发现 OPTSTAT(历史统计信息)相关的表占用近28G, AWR相关占用空间4G多，经分析OPTSTAT 的历史统计信息系统会自动清理失败有如下原因:因为历史统计信息较多，通过DBMS_STATS.PURGE_STATS清理比较困难，因此与客户沟通后对 wri$_optstat_histhead_history和 wri$_optstat_histgrm_history 进行 TRUNCATE 后再通过DBMS_STATS.PURGE_STATS清理其它表的数据，并

2、清理一些无效的ASH数据清理SYSAUX下的历史统计信息将历史统计信息保留时间设为无限exec dbms_stats.alter_stats_history_retention(-1);truncate 较大的 TABLEtruncate table sys.WRI$_OPTSTAT_HISTHEAD_HISTORY;truncate table sys.WRI$_OPTSTAT_HISTGRM_HISTORY;清理历史统计信息exec dbms_stats.purge_stats(sysdate-101);exec dbms_stats.purge_stats(sysdate-51);exe

3、c dbms_stats.purge_stats(sysdate-5);将历史统计信息保留时间设为10天exec dbms_stats.alter_stats_history_retention(10);将历史统计信息相关的表进行MOVEalter table sys.WRI$_OPTSTAT_HISTHEAD_HISTORY move tablespace sysaux;alter index sys.I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST rebuild online;alter index sys.I_WRI$_OPTSTAT_HH_ST rebuild online

4、;alter table sys.WRI$_OPTSTAT_HISTGRM_HISTORY move tablespace sysaux;alter index sys.I_WRI$_OPTSTAT_H_OBJ#_ICOL#_ST rebuild online;alter index sys.I_WRI$_OPTSTAT_H_ST rebuild online;alter table sys.WRI$_OPTSTAT_IND_HISTORY move tablespace sysaux;alter index sys.I_WRI$_OPTSTAT_IND_OBJ#_ST rebuild onl

5、ine;alter index sys.I_WRI$_OPTSTAT_IND_ST rebuild online;alter table sys.WRI$_OPTSTAT_TAB_HISTORY move tablespace sysaux;alter index sys.I_WRI$_OPTSTAT_TAB_OBJ#_ST rebuild online;alter index sys.I_WRI$_OPTSTAT_TAB_ST rebuild online;ALTER TABLE SYS.WRI$_OPTSTAT_OPR MOVE TABLESPACE SYSAUX;ALTER TABLE

6、SYS.WRI$_OPTSTAT_AUX_HISTORY MOVE TABLESPACE SYSAUX;ALTER INDEX SYS.I_WRI$_OPTSTAT_AUX_ST REBUILD ONLINE;ALTER INDEX SYS.I_WRI$_OPTSTAT_OPR_STIME REBUILD ONLINE;对MOVE表的统计信息进行收集EXEC dbms_stats.gather_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_HISTHEAD_HISTORY,cascade = TRUE);EXEC dbms_stats.gat

7、her_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_HISTGRM_HISTORY,cascade = TRUE);EXEC dbms_stats.gather_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_IND_HISTORY ,cascade = TRUE);EXEC dbms_stats.gather_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_TAB_HISTORY,cascade = TRUE);EXEC dbms_stat

8、s.gather_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_OPR,cascade = TRUE);EXEC dbms_stats.gather_table_stats(ownname = SYS,tabname = WRI$_OPTSTAT_AUX_HISTORY,cascade = TRUE);清理SYAUX下的无效ASH信息检查是否有无效的ASH信息select count(*)from sys.wrh$_active_session_history awhere not exists (select 1from sys.wrm$_

9、snapshot bwhere a.snap_id = b.snap_idand a.dbid = b.dbidand a.instance_number = b.instance_number);清理无效的ASH信息deletefrom sys.wrh$_active_session_history awhere not exists (select 1from sys.wrm$_snapshot bwhere a.snap_id = b.snap_idand a.dbid = b.dbidand a.instance_number = b.instance_number);对ASH表清理后

10、的碎片整理alter table sys.wrh$_active_session_history enable row movement; alter table sys.wrh$_active_session_history shrink space cascade; alter table sys.wrh$_active_session_history disable row movement;收集碎片整理后表的统计信息EXEC dbms_stats.gather_table_stats(ownname = SYS,tabname = WRH$_ACTIVE_SESSION_HISTORY

11、,cascade = TRUE);3.检查表空间可收缩的的位置select a.FILE#,a.NAME,a.BYTES / 1024 / 1024 mb,ceil(HWM * A.BLOCK_SIZE) / 1024 / 1024 RESIZETO,ALTER DATABASE DATAFILE | A.NAME | RESIZE | (trunc(CEIL(HWM * A.BLOCK_SIZE) / 1024 / 1024)+20) | M; RESIZECMDfrom v$datafile a,(SELECT C.file_id, MAX(C.block_id + C.blocks - 1) HWMFROM DBA_EXTENTS CGROUP BY FILE_ID) BWHERE A.FILE# = B.FILE_IDAND a.tablespace=SYSAUXORDER BY 5;SYSAUX清理后的检查1.清理后的无效INDEX检查select * from dba_indexes where statusVALID AND STATUSN/A;SELECT * FROM DBA_IND_PARTITIONS WHERE